Type-writing machine.



L NBY. TYPE WRITING MACHINE. 4PPLI'ATION FILM) 1APR.5, 1909.

Patented Dec. 20 1910.

UNITED STA1ES PATENT OFEICE.

LOUIS NEY, OF HARTFORD, CONNECTICUT, ASSGNOR T0 UNDERWOOD '1YIWRIJER CQMIANY, OENEW YORK, N. Y., A"CORPOBATION OIE NEW JERSEY.-

TY-E-WRITNG MACHINE.

Specification of Letters Patent. Patented B 20 1910 Application filed April 5, 1909. Serial No. 487,850.

the United States, residing in Hartford, in

the county of Hartiord and State of 0011 necticut,'have invented certain new and useful ImproVementS in Ty eiVriting Mal1ines, of which the followmg is a specifica- 1on. This invention relates to devices* for releasably connecting the platen to the line space wheel of a type-writing machine, to permit the platen tobe rotated independ ently of the line spaceWheel, when required. The principal object .of the invention is to provide, -at 10W cost, a Simple device of this character readily applicable t0 existing machmes, convemently manipulable, and not liable to become deranged:

In the form of the invention illustrated in the drawings, the line space wheel, which is loose upon the platen axle,is provided With a drum; and a collar which is fixed upon the platen axle carries one or more do s, to biteor grip the inner periphery of the c rum. A finger wheel also loose upon the pl'aten axle hais projections to operate the dogs. The dOgs are formed with arms having cam edgs along which said projections shde 'with a wedging action, thus giving the finger wheel an e-fiective purchase to' drive the dogs against the friction surface on the drum. Moreover, Said cam edges are of such form that they co-act with said projections to look said finger-wheel itself against accidental backWard or releasing movement.

In'the accompanying drawings, Figure 1 is a perspective viewshowing H1echanism slightly separated. Fig. 2 is,a view of the platen and platen frame of an Undexwood front strike Writing machine, with the present imfatovemnts applied thereto. Fig. 8 is an.end elevation partly in section, illustrating the manner in which the line space Wheel islocked to the platen. F g.

but showing the linespace wheel released from the platen.

The usua1 cylindrical platen 1 is fixed to an axle 2, whereby it isjournaled in a platen ram 3, said axle having at each end the usual thumb wheel 4, for rotating the platen.

Loose upon the platen axle, outside of the platen frame, is a notched lincspace wheel 5, usually engaged by a yielding dotent. 6.

Upon this lme-space wheelis showna ring or drum 7, W1flnn winch 1s contamed 21 parts of the clutching device comprising a cross arm 8 fixed' upon the platen axle, and a pair of dogs 9 pwoted at 10 to the ends; of the cross a1ms, in such positions that they can swing outwardly to grip forcibly the inner'periphery of said drum 7. It will be seen that a diametrical lime drawn'through the piv0ts 10 will touch the periphery 11 at points very close to said dogs 9, s0 thatthe latter are -en abled to secure a very' strong grip upon sa1d drum, and at points quite remote from the platen axle, to look the platen securely to the line space wheel. Also looseupon the platen axle, and rotatable independently of the linespace Wheel, is a finger wheel 12 havmg a knurled periphery 13,' and in the form of a cap to inclose the drum 7. Opposite pins 14 project inwardly from said fingerwheel 12 to engage arms 15 formed upon said dogs. These arms are providd on their inner -sides With cam edges 16, which are curved slightly eccentrically to the placen axle 2, and when the lii1e-space wheel iS turned to the left at Fig. 3, the pins work along said cam edges With aWedging action, to turn the dogs around the pivots 10, to bite the inner periphery of the drum. The

purchase of the pins. upon the dog arms, is

very great, owing to the slight eccentricity of their cam edgos; and thelength of the arms is such that an enormous leverage is afforded t.o force the dogsto grip the drum.

Said arms 15 may be slightly yielding, so as tb insure the desired 'action of both ofthe' dogs, that is, to permit further slightrotation of the finger'wheel 12 after one of the dogs has become locked, in order to Permit locking of the other dog, in-case there shonld,

accentricity of said cam edges 16 is so slight 'that after the finger wheei 19 is turned to b e any slight' irregularity in the manufac-' turc. It Will further be observed that the V Wheel elements, a revoluble finger wheel, and

turns said wheel 12 to the left as far as it movement of said Will go, While with the other hand he holds the platen from rotating. The Wheel 12 1s arrested simultaneousiy With the lockrng of the platen, lin-space whee1 and finger .wheel together. At any time the platen may be rotated by either thumb wheel 4.

It will be seen that the finger whee1 12 is convenientiy plaed between said line-space Whee1 and the adjacent thumb wheel4.

Variations may be resorted to within the scope of the invention.

Having thus described my invention, I daim:

1. In a typewriting machine, the combination with a revoluble platen.having an axle, of a member loose upon the'platen axle and consisting of a lime-space wheel, a second membcr also loose upon the platen axle and revoluble thereon manuaHy inde}gendently of said line-space Whee1, and a third member movable relatively to both the line-space wheel and the platen;- said second member having means to enable said third member to arrest the rotation of said second memher and simultaneousiy lock said platcn and said first, second and third members together.

2. In a typewriting machine, the combination with a revoluble platen, of a ioose line- 'space wheel, a movable dog between the line- -space wheel and theplaten to grip a friction surface provided upon one of the platen and means operated by said wheel to actupon both saidfidog and said wheei to cam or Wedge the dog against said friction surface,

and also to' camor wedge said finger-wheel t0 arrest it and look it against accidental releasing or backward movemcnt.

3. I n.a typewriting machine, the combination With a*revoiuhle platen, of a loose linespace wheel, a ivoted dog between the linespace Wheel an the platen, to grip a surface provided upon one'of the platen and wheel elements, said dog having an arm, and a revoluble finger-wheelprovided with a projection to turn said aim to cause the dog to bite said surface, saidarm having a cam edge engaged by said projection and s1ightly inclined to the path of movement of said projction,to coperate with the latter bot-h t0 Iock the dog against said sur-face and to arrest and look said finger-Wheclagainst accidental releasing movement.

4. In a typewriting machine, the combination with a platen and an xle therefor, of

a loose linespace wheel, a collar -fixed on drum; said oy said pro the path of tion with a revoluble platen anda the dog toprojection, t0 coperate With the latter both to look the do against said periphery and to arrest and Iock said fingerwheel against accidental rel easing movement.

5. In a typewriting machine, the combination with a platen and an ax1e therefor, of a loose line-space,wheei, a coHar fixed on said axle, a dog pivoted on said collar and having an arm, a drum or ring upon said line-space Wheel to inclose said dog, and a ieVoluble finger-wheel carrying a pin or projection to move said arm t0 cause the dog t0 bite the inner peripher} of said drum; said arm having a cam edge engaged by said projection, to coperate with the latter both to-lock the dog' against said periphery and to arrest and hold said finger-whecl against accidental releasin movcment: said fin er-wheel havin the form of a cap inclosing said drum.

6. In a typewriting machine, the combination With a platen and an axle therefor, of a linespace wheel loose on.said axle, a collar fixed on said axle,a pair of doge pivbted on said collar, each having a springy arm, a drum or ring upon said line-spac'ewheeito inclose said dogs, and a revoluble fingerwheel carrying a pair of pins or projections to move said arms to cause the dogs to bite the inner peripher of said drum, said arms having cam edges slightly'inclined to the paths of movement of said projections, and engaged by said projections to coperate with the latter, both to lock the doge against saidperiphcry and to arrest and look said finger-Wheel -against accidental ieleasing movement.

7. In a typewriting machine, the combiner tion of a revoluble platen, a loose line space wheel, a friction drum or member, a frictien dog ehgageable with said drum or member, and a finger wheel revohible independently about the axis of the platen, and hai ing'means for forcing said dog into biting engagement'with said drum or member, and for simultaneously arrestingand Iocking said finger-Wheel against accidental platen releasing movement. v

8. In a typewriting machine, the combinaplaten axie, of a line-space wheei, an intervening friction drum or ring, a pair of dogs hairing pivotal support on the platen axle and extendin from said dogs around the inner pemphery of said drum,a finger-wheel revo- 'luble oh the platen axle, and projections con- 'nected to said finger wheel t0 engage the innersides of said arms to force the dogs outwardly to bind said drum and lock the line-space wheel to the platen.

9. In a typewriting machine, the combination with a r avoluhle platen, a platen axle, and a line-space wheel, of an intervening friction drum or ring, a dog having a piv- ,engageable .with said friction drum, arms otal support on said platen axle and engage te force the latter outwatdly to b'indagainst able w1t-h sa1d frict1on drum, an arm extendsa1d drum and lock the hnespace wheel t0 10 ing from saddog around the iner peri'phthe platen.

ery of said drum, a fingr-wheel revolube upon the platen axle, and a projection con nected to said finger-wheel t0 engage 'the W itnessesz inner side of said arm, and by rotation off W. Iv. BYORKMAER, s'aid finger-wheel t0 swing the arm nd (10g LYMAN D. BROUGHTN.

LOUIS NEY. 

